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<p><strong>POI提供了HSSF、XSSF以及SXSSF三种方式操作Excel</strong></p>
<p><strong>HSSF</strong>：Excel97-2003版本，扩展名为.xls。一个sheet最大行数65536，最大列数256。</p>
<p><strong>XSSF</strong>：Excel2007版本开始，扩展名为.xlsx。一个sheet最大行数1048576，最大列数16384。</p>
<p><strong>SXSSF</strong>：是在XSSF基础上，POI3.8版本开始提供的支持<strong>低内存占用</strong>的操作方式，扩展名为.xlsx。</p>
<blockquote>
<p>注意：xssf是将数据存在内存，所以为了防止内存溢出，就出现了sxssf</p>
<p>SXSSFWorkbook w3= new SXSSFWorkbook(1000);</p>
</blockquote>
<p>上面 SXSSFWorkbook 设置内存中最多只有1000行数据，当超过这个数据时，就将内存之前的数据删除，并且会在硬盘中生成临时文件。从而保证了低内存消耗。</p>
<p><strong>Jakarta POI HSSF API组件:</strong></p>
<table>
<thead>
<tr>
<th>组件</th>
<th>描述</th>
</tr>
</thead>
<tbody><tr>
<td>HSSFWorkbook</td>
<td>excel的文档对象</td>
</tr>
<tr>
<td>HSSFSheet</td>
<td>excel的表单</td>
</tr>
<tr>
<td>HSSFRow</td>
<td>excel的行</td>
</tr>
<tr>
<td>HSSFCell</td>
<td>excel的格子单元</td>
</tr>
<tr>
<td>HSSFFont</td>
<td>excel字体</td>
</tr>
<tr>
<td>HSSFCellStyle</td>
<td>cell样式</td>
</tr>
</tbody></table>
<p><strong>Jakarta POI XSSFAPI组件:</strong></p>
<table>
<thead>
<tr>
<th>组件</th>
<th>描述</th>
</tr>
</thead>
<tbody><tr>
<td>XSSFWorkbook</td>
<td>excel的文档对象</td>
</tr>
<tr>
<td>XSSFSheet</td>
<td>excel的表单</td>
</tr>
<tr>
<td>XSSFFRow</td>
<td>excel的行</td>
</tr>
<tr>
<td>XSSFCell</td>
<td>excel的格子单元</td>
</tr>
<tr>
<td>XSSFFont</td>
<td>excel字体</td>
</tr>
<tr>
<td>XSSFCellStyle</td>
<td>cell样式</td>
</tr>
</tbody></table>
<h3 id="导出"><a href="#导出" class="headerlink" title="导出"></a>导出</h3><h4 id="pom-xml"><a href="#pom-xml" class="headerlink" title="pom.xml"></a>pom.xml</h4><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">dependency</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">groupId</span>&gt;</span>org.apache.poi<span class="tag">&lt;/<span class="name">groupId</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>poi<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">version</span>&gt;</span>3.14<span class="tag">&lt;/<span class="name">version</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">dependency</span>&gt;</span></span><br></pre></td></tr></table></figure>



<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title function_">exportExcel</span><span class="params">()</span>&#123;</span><br><span class="line">    <span class="type">XSSFWorkbook</span> <span class="variable">workbook</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">XSSFWorkbook</span>();</span><br><span class="line">    <span class="type">XSSFSheet</span> <span class="variable">xssfSheet</span> <span class="operator">=</span> xssfWorkbook.createSheet(<span class="string">&quot;sheet名称&quot;</span>);</span><br><span class="line">    <span class="type">XSSFRow</span> <span class="variable">title</span> <span class="operator">=</span> sheet.createRow(<span class="number">0</span>); <span class="comment">//创建行 </span></span><br><span class="line">    </span><br><span class="line">    String[] titleNameArr = &#123;<span class="string">&quot;姓名&quot;</span>,<span class="string">&quot;班级&quot;</span>,<span class="string">&quot;学号&quot;</span>,<span class="string">&quot;性别&quot;</span>,<span class="string">&quot;兴趣&quot;</span>&#125;;</span><br><span class="line">    <span class="keyword">for</span>(<span class="type">int</span> i=<span class="number">0</span>;i&lt;titleNameArr.length; i++)&#123;</span><br><span class="line">        sheet.setColumnWidth(i, <span class="number">15</span> * <span class="number">256</span>); <span class="comment">// 设置单元格宽度</span></span><br><span class="line">        <span class="type">XSSFCell</span> <span class="variable">titleCell</span> <span class="operator">=</span> title.createCell(i);<span class="comment">//创建单元格子</span></span><br><span class="line">        titleCell.setCellValue(titleNameArr[i]);</span><br><span class="line">    &#125;</span><br><span class="line">    </span><br><span class="line">    <span class="comment">// 获取数据后</span></span><br><span class="line">    List&lt;Student&gt; studentList = queryData();</span><br><span class="line">    <span class="comment">// 根据数据创建内容行以及该行单元格子</span></span><br><span class="line">    <span class="keyword">for</span>(<span class="type">int</span> i=<span class="number">0</span>,rowIndex=<span class="number">1</span>;i&lt;studentList.length;i++,rowIndex++)&#123;</span><br><span class="line">        <span class="type">XSSFRow</span> <span class="variable">dataRow</span> <span class="operator">=</span> sheet.createRow(rowIndex);</span><br><span class="line">        <span class="type">Student</span> <span class="variable">student</span> <span class="operator">=</span> studentList.get(i);</span><br><span class="line">        String[] excelEntityyArr =&#123;student.getName(),stuent.getClassName(),student.getNo(),student.getSex(),student.getHobby()&#125;;</span><br><span class="line">        dataRow.createCell(j).setCellValue(excelEntityProperyArr[j]);</span><br><span class="line">        <span class="comment">// 5、导出excel</span></span><br><span class="line">        response.setHeader(<span class="string">&quot;Content-Disposition&quot;</span>, <span class="string">&quot;attachment;filename=&quot;</span> + URLEncoder.encode(<span class="string">&quot;表名.xlsx&quot;</span>, <span class="string">&quot;UTF-8&quot;</span>));</span><br><span class="line">        <span class="type">ServletOutputStream</span> <span class="variable">out</span> <span class="operator">=</span> response.getOutputStream();</span><br><span class="line">        xssfWorkbook.write(out);</span><br><span class="line">        out.close();</span><br><span class="line">    &#125;</span><br><span class="line">    </span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>





<p>设置样式</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//样式</span></span><br><span class="line"><span class="type">XSSFFont</span> <span class="variable">font</span> <span class="operator">=</span> workbook.createFont();</span><br><span class="line">font.setFontName(<span class="string">&quot;方正楷体&quot;</span>);</span><br><span class="line">font.setFontHeightInPoints((<span class="type">short</span>) <span class="number">12</span>);</span><br><span class="line">font.setBold(<span class="literal">true</span>);</span><br><span class="line"><span class="type">XSSFCellStyle</span> <span class="variable">cellStyle</span> <span class="operator">=</span> workbook.createCellStyle();</span><br><span class="line">cellStyle.setAlignment(HorizontalAlignment.CENTER);</span><br><span class="line">cellStyle.setFont(font);</span><br></pre></td></tr></table></figure>













<h2 id="其他"><a href="#其他" class="headerlink" title="其他"></a>其他</h2><p>SpringBoot+Poi+ajax实现导出 <a target="_blank" rel="noopener" href="https://www.cnblogs.com/CF1314/p/16331514.html">excel</a></p>
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